How to Extend Smartphone Battery Life: A Practical Guide for Android and iPhone
If your battery doesn't last the day, you can significantly improve it through settings optimization. We've summarized practical ways to extend battery life on both Android and iPhone.
If your smartphone battery drops below 30% by the afternoon no matter how much you charge it, you should check your settings before blaming your usage habits. In default configurations, many features that unnecessarily consume battery are often turned on.
Changing just a few settings can increase your perceived usage time by 20–40%.
1. What Consumes the Most Battery?
These are the primary causes of smartphone battery drain.
| Factor | Drain Ratio (Approx.) |
|---|---|
| Screen Brightness & Timeout | 30–40% |
| Background App Execution | 15–25% |
| Location Services (GPS) | 10–20% |
| Mobile Data & Wi-Fi Connection | 5–15% |
| Push Notifications & Sync | 5–10% |
Since the screen accounts for the largest portion, adjusting screen-related settings is most effective.
2. Common Battery Saving Settings
Basic settings applicable to both Android and iPhone.
Lower Screen Brightness + Use Auto-Brightness
Using screen brightness at its maximum is the biggest cause of battery drain.
- Keep the Auto-Brightness (Adaptive Brightness) feature on to adjust automatically based on ambient lighting.
- Indoors, 50% brightness or less is often sufficient.
- Maximum brightness is rarely needed unless you are under direct sunlight.
Shorten Auto-Lock/Screen Timeout
Reduce the time the screen stays on when left idle.
- Settings → Display → Screen Timeout: Set to 30 seconds to 1 minute.
Limit Location Services
GPS consumes a lot of battery. Allow location access only for necessary apps.
- Maps, Delivery Apps: Allow only while using the app.
- Social Media, Games, etc.: Turn off location access.
Turn Off Unnecessary Notifications
Every time a notification arrives, the screen turns on, and vibration/sound triggers, consuming battery. It's best to turn off notifications for apps you don't use frequently.
Turn Off Bluetooth & Wi-Fi When Not in Use
Turning off Bluetooth and Wi-Fi when not using them helps save battery. Specifically, if Bluetooth is on without any connected devices, it continuously searches for devices, consuming power.
3. Android Battery Saving Settings
Utilize Battery Optimization Features
Settings → Battery → Battery Optimization (or Power Saving Mode).
Most Android smartphones have built-in battery optimization features from the manufacturer. Setting rarely used apps to Deep Sleep Mode blocks background execution.
For Samsung Galaxy:
- Settings → Battery and Device Care → Battery → Background usage limits.
Disable Always On Display (AOD)
AOD displays the clock or notifications even when the screen is off. It's convenient but consumes battery. It's best to turn it off if not needed.
Switch 5G → LTE
Using 5G on 5G-enabled devices consumes 20–30% more battery compared to LTE. In situations where 5G isn't necessary, changing to LTE in settings noticeably increases battery life.
- Settings → Connections → Mobile networks → Network mode → LTE.
Adjust Refresh Intervals
Limit how often each app refreshes data in the background.
- Settings → Apps → (Selected App) → Battery → Restrict background.
4. iPhone (iOS) Battery Saving Settings
Utilize Low Power Mode
This is automatically suggested when the battery drops below 20%, but you can also turn it on in advance.
- Settings → Battery → Enable Low Power Mode.
In Low Power Mode, email fetch frequency is reduced, background app refresh is disabled, and screen brightness is automatically lowered.
Limit Background App Refresh
Settings → General → Background App Refresh → Off or select by app.
If this feature is on, apps continue to fetch data even when not on the screen. Turning this off for news and SNS apps is effective for saving battery.
Refine Location Services
Settings → Privacy & Security → Location Services.
Change location access for each app to While Using the App. Apps set to 'Always Allow' track location continuously, resulting in high battery drain.
Adjust Frame Rate (Pro Models)
The iPhone Pro series supports up to 120Hz refresh rates. Lowering this to 60Hz for general use saves battery.
Settings → Accessibility → Motion → Limit Frame Rate → On.
5. Charging Habits to Extend Battery Life
Beyond settings, charging habits affect battery lifespan (long-term performance).
- Maintain the 20–80% Range: Discharging to 0% or frequently maintaining 100% shortens battery life.
- Avoid Excessive Fast Charging: Fast charging is convenient, but increased heat can affect long-term lifespan.
- Watch Out for Wireless Charging Heat: If wireless charging while using a case causes severe heat, remove the case.
- Avoid Games/Videos While Charging: Using high-spec apps while charging causes severe heat, putting a burden on the battery.
On iPhone, you can check your current maximum battery capacity in Settings → Battery → Battery Health & Charging. If it has dropped below 80%, you should consider a battery replacement.
Conclusion
Battery-saving settings aren't about enduring inconvenience. It's about turning off features you actually rarely use or didn't know were running. The most effective management method is to apply these settings one by one and periodically check which apps consume the most in the battery usage screen.